Spray a large slow cooker with cooking spray.,Then layer both kinds of mushrooms into the bottom, followed by frozen chicken breasts.,Add melted butter, soup, Italian dressing packet and Italian Cheese and Herb Cooking cream into the crockpot, stirring as you add everything.,Close lid and cook on low for 5 hours.,With about 1 1/2 hours before serving time, make a batch of Baked Brown Rice (instructions below).,And just before serving, add your cornstarch water mix into the chicken mixture and stir to thicken sauce.,Serve rice topped with a chicken breast and a bunch of sauce.,______,Bake for 1 hour and 10 minutes.,Remove from oven and let it sit 5 minutes before removing foil and fluffing with fork.,Delicious!